I once had a 4k line javascript file (a vuex module), which I navigated using / in vim, which came with another 20k likes of tests (also in the single file). I

I once had a 4k line javascript file (a vuex module), which I navigated using / in vim, which came with another 20k likes of tests (also in the single file). I would say 5k lines is the real celling.